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Finding the Fourth Proportional to 1,298.88, 1,949.00 and 779.93

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Solution

The fourth proportional to 1,298.88, 1,949.00 and 779.93 is: 1,170.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.88 : 1,949.00 = 779.93 : x
  2. Step 2: Convert to fraction form
    1,298.88/1,949.00 = 779.93/x
  3. Step 3: Cross multiply
    1,298.88x = 1,949.00 × 779.93
  4. Step 4: Simplify right side
    1,298.88x = 1,520,069.93
  5. Step 5: Solve for x
    x = 1,520,069.93/1,298.88
  6. Step 6: Final answer
    x = 1,170.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.